C/2025 K1 (ATLAS) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Today | 6 Jul 2025 | 15.1 | 1.995 AU | 1.302 AU | 21h57m | +21°56' | 118.2° | 26.7° | 227° |
Perihelion | 8 Oct 2025 | 5.0 | 0.334 AU | 1.292 AU | 12h35m | -12°27' | 8.1° | 25.0° | 217° |
Nearest approach | 24 Nov 2025 | 9.6 | 1.193 AU | 0.401 AU | 09h34m | +63°57' | 111.3° | 50.5° | 274° |
C/2025 K1 (ATLAS)- 2025-07-06
astro.vanbuitenen.nl
The interactive orbit chart above shows the comet's path through the solar system and its position at the given date.
Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below.
(Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)
The orbital elements of C/2025 K1 (ATLAS) are:
e (Eccentricity) : 1.0002050
q (Perihelion distance) : 0.3341400
i (Inclination) : 147.86440
Ω (Longitude of ascending node) : 97.55720
ω (Argument of perihelion) : 271.03420
L (Longitude of perihelion) : 186.33594
B (Latitude of perihelion) : -32.12974
T (Time of perihelion passage) : 2460956.94480
Epoch : 2025 Jul 05
Reference : MPEC 2025-MC0
Classification(s): : Nearly isotropic; New (a > 10000 AU)
The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC.
The gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (12.20 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 10.60 + 5 log[∆] + 13.01 log[r]).
The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.
The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
A more printer-friendly version of the same chart can be found further down this page as well.
The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.
A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
Ephemerides:
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2025-07-06 00:00 UT 21 58 28.2 +21 51 58 1.314 2.001 117.8 26.7 227 15.1
2025-07-06 09:47 UT 21 57 35.1 +21 56 24 1.302 1.995 118.2 26.7 227 15.1
2025-07-07 00:00 UT 21 56 15.7 +22 02 48 1.285 1.986 118.8 26.7 226 15.0
2025-07-08 00:00 UT 21 53 54.8 +22 13 36 1.256 1.970 119.8 26.6 225 14.9
2025-07-09 00:00 UT 21 51 25.2 +22 24 21 1.228 1.954 120.8 26.5 223 14.8
2025-07-10 00:00 UT 21 48 46.2 +22 35 00 1.199 1.938 121.8 26.5 222 14.7
2025-07-11 00:00 UT 21 45 57.3 +22 45 33 1.171 1.922 122.8 26.4 221 14.6
2025-07-12 00:00 UT 21 42 58.0 +22 55 58 1.143 1.906 123.9 26.3 219 14.5
2025-07-13 00:00 UT 21 39 47.5 +23 06 11 1.115 1.890 124.9 26.2 218 14.4
2025-07-14 00:00 UT 21 36 25.2 +23 16 10 1.088 1.874 125.9 26.1 216 14.3
2025-07-15 00:00 UT 21 32 50.3 +23 25 51 1.061 1.858 126.9 25.9 214 14.2
2025-07-16 00:00 UT 21 29 02.2 +23 35 12 1.034 1.842 127.9 25.8 212 14.1
Terminology:
delta: distance between comet and earth in AU
radius: distance between comet and sun in AU
magn: magnitude (brightness) estimate
ra: right ascension in hours (24h = 360deg)
dec: declination in degrees
elong: elongation in degrees (angle sun-earth-comet)
phase: phase angle in degrees (angle sun-comet-earth)
AU: Astronomical Unit (mean distance between earth and sun: 149597870.7 km
Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.